Illinois Gov. J.B. Pritzker (D) on Monday urged residents to continue to take precautions and to wear masks even as coronavirus vaccination efforts are underway, citing the World Health Organization’s (W.H.O.) recent warning about the Delta variant and subsequently mask guidance, urging fully vaccinated people to wear masks.

“The lessons here at home and across the world are a harbinger of what could happen here, particularly in low vaccinated areas, if we don’t see a higher uptake of the vaccine across Illinois,” Pritzker said on Monday while wearing a mask.

“This is very real. I implore all residents: If you have friends and family on the fence, share with them the life-saving benefits of these free vaccines and encourage them to remain masked until they are fully vaccinated,” he continued, noting that he was wearing a mask “out of an abundance of caution,” despite the Centers for Disease Control and Prevention (CDC) guidance, which effectively clears vaccinated individuals from face coverings.

“I think when we leave our home every day, I would encourage everybody — whether you’re vaccinated or not — to bring your mask with you,” the Democrat governor said. “You know what the guidelines are across the state of Illinois, and use your mask accordingly.”

The CDC has identified the Delta variant as a “variant of concern,” and the W.H.O. is now urging fully vaccinated individuals to wear masks as well.

“People cannot feel safe just because they had the two doses,” W.H.O. official Dr. Mariangela Simao said last week. “They still need to protect themselves.”

“Vaccine alone won’t stop community transmission,” she continued. “People need to continue to use masks consistently, be in ventilated spaces, hand hygiene … the physical distance, avoid crowding.”

“This still continues to be extremely important, even if you’re vaccinated when you have a community transmission ongoing,” she added.

According to the Chicago Sun-Times, 84 cases of the Delta variant “had been reported in Illinois through Sunday – the fewest of any of the six variants — but the governor said he and his public health team ‘expect it to dominate our cases statewide by the fall.'”

Similarly, LA County officials are recommending people to mask up yet again in indoor settings due to the spread of the highly transmissible Delta variant.